cast
-
Guy Williams
Dr. John Robinson
-
June Lockhart
Dr. Maureen Robinson
-
Mark Goddard
Major Don West
-
Marta Kristen
Judy Robinson
-
Angela Cartwright
Penny Robinson
-
Bill Mumy
Will Robinson
-
Jonathan Harris
Dr. Zachary Smith
- Dick Tufeld Robot B-9
- Bob May Robot B-9
- Dawson Palmer Monster / Bog Monster / IDAK Omega 17 / Moss monster / Android Raddion / Angus / Cosmic Monster / Creature / Keel
-
Fritz Feld
Mr. Zumdish
-
Sheila Allen
Ruth Templeton / Brynhilda / Aunt Gamma
- Ron Gans Frog Alien (voice) / Alien Leader / Creature (voice)
-
Dee Hartford
Verda / Nancy Pi Squared
-
Leonard Stone
Farnum
-
Albert Salmi
Captain Alonzo P. Tucker
-
Michael Rennie
The Keeper
-
Vitina Marcus
Athena / Lorelei
-
Michael Fox
Alien on Computer Screen (voice) / Cybernetic Leader / Supreme Brain (voice)
-
Don Matheson
Rethso / IDAK Alpha 12
-
Joe E. Tata
Zalto's Dummy (voice) / Purple Robot (voice)
- Don Forbes TV Commentator
- Theodore Lehmann Disk (voice) / Alien
-
Gregory Morton
Canto of Quasti (voice) / Judge Iko (voice)
-
Allan Melvin
Little Joe / Gambling Machine (voice) / Enforcer Claudio
- Tiger Joe Marsh Security Guard / Elevator Operator
-
Hoke Howell
Security Guard / Sgt. Rogers
-
Sue England
Space Control Officer O-3 (voice) / Female Robot (voice)
- William Bramley Robotoid (voice) (uncredited) / Mr. Nobody
- Keith Taylor Edgar / Theodore the bully
-
Robert Foulk
Cragmire / Kraspo
-
Marcel Hillaire
Junkman / Phanzig
- Fred Krone Monster / Chronos' Alien Assistant
-
Ted Cassidy
Slave
-
Melinda O. Fee
Fenestra
-
Wally Cox
Tiabo
-
Dennis Patrick
Keema
-
Strother Martin
Nerim
-
Mike Kellin
Myko
-
Henry Jones
Jeremiah Smith
-
Gerald Mohr
Morbus
- Mickey Manners Dee
-
Torin Thatcher
The Space Trader
-
Michael J. Pollard
The Boy
-
Michael Ansara
The Ruler
-
Hans Conried
Sagramonte
- Wilbur Evans Lighted Head Leader
- Lamar Lundy The Giant Cyclops
-
John Carradine
Arcon
-
Sean McClory
Hamish
-
Al Lewis
Zalto
-
Francine York
Niolani
-
Werner Klemperer
Bolix
-
Warren Oates
Jimmy Hapgood
-
Robert Easton
Newsman Lacy
- Frank Delfino
-
Ronald Long
Admiral Zahrk
-
Kevin Hagen
Alien
-
Lew Gallo
Cmdr. Fletcher
-
Arthur Batanides
Rongah
-
Kym Karath
Princess
-
Lyle Waggoner
Mechanical Man
-
Daniel J. Travanti
Space Hippie
-
Stanley Adams
Tybo
-
Vincent Beck
Megazor
-
Abraham Sofaer
Sobram
-
Mercedes McCambridge
Sybilla
-
Michael Conrad
Creech
-
Lou Wagner
J-5
-
John Crawford
Dr. Chronos
-
Eddie Quillan
Bartender
-
Malachi Throne
Thief
-
Walter Burke
O. M.
-
Peter Brocco
Alien Leader
- Janos Prohaska Bird Monster
-
James Westerfield
Dr. Marvello
-
Kurt Russell
Quano
-
Larry Ward
Ohan
-
Reta Shaw
Aunt Clara Simms
-
John Abbott
Sesmar
-
Sherry Jackson
Effra
-
Arte Johnson
Fedor
-
Tol Avery
Warden
-
Liam Sullivan
Nexus
-
Royal Dano
Major Domo
-
Woodrow Parfrey
Col. Silas Fogey
-
Edy Williams
Non
-
Chuck Roberson
Alien Fighter
-
Lane Bradford
Barfly
-
Helen Kleeb
Phone Operator Rachel
- Brett Parker Security Guard
-
Ford Rainey
The President
- Hal Torey General
- Fred Crane Alpha Control Technician
- Robert 'Big Buck' Maffei The Giant Cyclops
- Françoise Ruggieri Moela
-
Charles Dierkop
Horned Mutant
-
Walter Sande
Sheriff George Baxendale
- Donald Losby Davey Sims
-
Harry Harvey
Grover
-
Anne Dore
First Selectman
-
Michael Greene
Nubu
- Harry Monty Geoo
- Maxine Gates Fat Princess
-
Ken Mayer
Pleiades Pete
- Bill Troy Alien
- Harry Raybould Urso
-
June Foray
Gundemar (voice)
- Jeff County Gundemar
- Larry Dean Wooden Soldier
-
Bern Hoffman
Thor
-
Jim Boles
Smeek
- Craig Duncan Deek
-
Alan Hewitt
Lemnoc
- Jim Mills Saticon
- Duke Fishman Convict
- Ben Frommer Convict
- Lars Hensen Convict
-
Gil Perkins
Convixt
- Mike Morelli Convict
- Pitt Herbert Grover
- Claire Wilcox Stacy
-
Norman Leavitt
Charlie
-
Robert Pine
Craig
-
Grant Sullivan
Alien
- Carol Williams Alien
-
Tommy Farrell
Cyborg
- Bart La Rue Alien Machine (voice)
- Kenya Coburn Zaybo
- Don Eitner Sgt. Smith
-
Linda Gaye Scott
Aien Girl
- Ralph Lee Mechanical Man
- Gary Tigerman Oggo
- Ronald Weber Mort
- Tom Allen Inspector (uncredited)
- Carroll Roebke Tat
- Eric Matthews QZW
- Richard Krisher MXR
-
Corinna Tsopei
Princess Reyka
- Alberto Monte Chavo
- Jim Gosa Gilt Proto
-
Byron Morrow
General Squires
- Gil Rogers Bartholomew
-
Charles Horvath
Guard
- Miriam Schiller Miss Teutonium
-
James Millhollin
Willoughby
-
Ollie O'Toole
Robotoid (voice) (uncredited)
- Hal Jon Norman Dog-faced Alien (uncredited)
